JP2013101810A - Normally-closed contact type electromagnetic relay and on-vehicle electromagnetic device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle normally-closed contact type electromagnetic relay for holding a stable closed route state without affecting vibration of a plunger or the like to a movable contact.SOLUTION: A return spring which pressurizes a plunger to the reverse contact side in normal time is provided to a gap between a contact side magnetic core and a contact part installed in the driving direction of the plunger by electromagnetic force, the return spring is constituted so as to be insulated with a fixed contact, and to further pressurize a non-conductive member for deviating a movable contact from the fixed contact.

Description

  The present invention relates to an in-vehicle electromagnetic device mounted on an automobile or the like, and more particularly to a normally closed contact type electromagnetic relay that drives a plunger with electromagnetic force to open a contact and interrupt an electric circuit.

Conventionally, various types of electromagnetic relays have been developed and widely used for attracting a plunger with an electromagnet and opening and closing a contact.
As electromagnetic relays in such fields, there are those described in Japanese Patent Laid-Open No. 11-224581 (Patent Document 1) and Japanese Patent Laid-Open No. 4-351823 (Patent Document 2). In this electromagnetic relay, the plunger attracted by the electromagnet is urged away from the magnetic core by the load of the return spring, and the movable contact is pressed against the fixed contact via a part of the plunger or another member. ing.

  In addition, the electromagnetic relay described in Japanese Patent Application Laid-Open No. 61-0332319 (Patent Document 3) and Japanese Patent Application Laid-Open No. 2011-142067 (Patent Document 4) urges the plunger attracted by the electromagnet by the load of the return spring. Thus, the movable contact is separated from the fixed contact via a part of the plunger or another member.

Japanese Patent Laid-Open No. 11-224581 JP-A-4-351823 JP 61-0332319 A Japanese Unexamined Patent Publication No. 2011-142067

  In the normally closed contact electromagnetic relays described in Patent Document 1 and Patent Document 2 described above, when the vehicle travels and when vibrations from the engine are applied, the movement of the plunger against the vibrations is directly or indirectly through other members. Therefore, it is difficult to maintain a stable closed state of the contact point during running and engine operation, and the load of the return spring that biases the plunger is increased to maintain a stable closed state. Since it is necessary to set, an electromagnetic force that generates a high attractive force according to the load of the return spring is required.

  In addition, the electromagnetic relay described in Patent Document 3 has a contact structure that is not affected by the plunger during vibration. However, since it is a normally open contact type electromagnetic relay, in order to change to a normally closed contact type electromagnetic relay. Needs to be changed to a contact configuration similar to that of the electromagnetic relay described in Patent Document 1 and Patent Document 2. In this case, the same problem as in Patent Document 1 and Patent Document 2 occurs.

  Further, by replacing the positions of the plunger and the magnetic core, it is necessary to change the attracting direction of the plunger to the contact direction described in Patent Document 3 and to change the biasing direction of the plunger by the return spring to the opposite contact side. In this case, it is necessary to provide a through hole through which the non-conductive member pressed by the plunger for separating the movable contact from the fixed contact can be provided in the magnetic core on which the plunger is seated, and in the gap between the plunger and the magnetic core. Since the return spring is interposed, there is a problem that the cross section of the magnetic circuit is further reduced and it is difficult to obtain the driving force of the plunger by electromagnetic force.

  Further, in Patent Document 4, since the return spring is disposed between the inner peripheral surface of the fixed iron core and the movable iron core and the shaft driven by the movable iron core, the magnetic path area is reduced and a high attractive force is generated. As a result, there is a problem that the loads of the contact spring and the return spring cannot be set high.

  The normally closed contact type electromagnetic relay according to the present invention is provided with a return spring that presses the plunger toward the non-contact side in the gap between the contact portion and the magnetic core of the contact side installed in the driving direction by the electromagnetic force of the plunger. A non-conductive member that is insulated from the fixed contact and further separates the movable contact from the fixed contact is directly pressed.

  According to the present invention, the return spring is excluded from the magnetic circuit that is the path of the magnetic flux, and the cross-sectional area of the magnetic circuit that generates the electromagnetic force in the driving force of the plunger is not reduced. The load of the return spring to be pressed and the contact spring to press the movable contact to the fixed contact can be set high, and a stable contact closed state and a stationary state of the plunger can be secured. Furthermore, since the movable contact is separated from other parts such as a plunger in the normal contact normally closed state, it is possible to obtain a stable conduction performance in which the movable contact is not affected by the plunger during vibration. A closed contact electromagnetic relay can be provided.

It is sectional drawing which shows the normally closed contact type electromagnetic relay by Embodiment 1 of this invention. It is sectional drawing which shows the normally closed contact type electromagnetic relay by Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, a normally closed contact type electromagnetic relay according to Embodiment 1 of the present invention will be described with reference to the drawings.
1 is a cross-sectional view of a normally closed contact type electromagnetic relay according to Embodiment 1 of the present invention.
In FIG. 1, a normally closed contact type electromagnetic relay includes a case 10, an excitation coil 11 that is disposed in the case 10 and generates a magnetic flux when energized, a bobbin 12 around which the excitation coil 11 is wound, and the bobbin 12. The contact-side magnetic core 13 is disposed so as to close the opening of the case 10 from one end or one end to the inner diameter portion thereof. 14, a magnetic core 15 disposed at the other end of the bobbin 12, a contact-separating non-conductive member 17 which is brought into contact with and moved by the plunger 14, and the non-conductive member 17 is attached against the pressing force of the plunger 14. A return spring 18 is provided, and a non-conductive member 19 that receives one end of the return spring 18 is provided.

Further, a cap 20 disposed in the case 10 and the contact-side magnetic core 13 via the packing 19, a pair of main terminals 21 that pass through a part of the cap 20 and are attached at opposing positions, and a part of the main terminal 21 The fixed contact 21a formed in the contact point 21a, the contact spring 22 disposed in the contact chamber 20a formed by the fixed contact 21a and the inner peripheral surface of the cap 20, and the contact spring 22 is pressed against the fixed contact 21a electrically. A movable contact 23 to be connected is provided.
Since the non-conductive member 19 receives the reaction force of the return spring 18, the non-conductive member 19 is in contact with the opposite contact surface of the fixed contact 21 a fixed to the cap 20.

Under such a configuration, in a normal state, as shown in the figure, the non-conductive member 17 is urged to the opposite contact side by the pressing force of the return spring 18, and the movable contact 23 is moved to the fixed contact 21a by the contact spring 22. When pressed, the pair of main terminals 21 are electrically connected.
Next, when the coil 11 is energized, a magnetic force acts on the plunger 14 via the contact side core 13 and the magnetic core 15, moves the plunger 14 and the nonconductive member 17 to the contact side, and presses the movable contact 23. The connection with the fixed contact 21a is separated.

With this configuration, the movable contact 23 can be maintained in a stable contact closed state without being affected by vibrations other than the contact spring 18 even when vibration is generated such as when the vehicle is running. Further, by arranging the return spring 18 in the space to the contact point outside the magnetic circuit, the cross-sectional area of the magnetic circuit can be secured, and the necessary attractive force can be easily secured.
In the above configuration, the return spring 18 is arranged between the fixed contact 21 a and the contact side core 13, but the end surface of the nonconductive member 17 that receives the return spring 18 is in the contact side core 13. Intrusion and return spring 18 may overlap with part of contact-side core 13. Further, a step may be provided on the inner peripheral surface of the cap 20, and the non-conductive member 19 may be received on the step surface.
In addition, the non-conductive member 19 surrounds the fixed spring 21a side of the return spring 18 so that the insulation distance between the fixed contact 21a in the live line state and the return spring 18 can be properly secured.

Embodiment 2. FIG.
FIG. 2 is a cross-sectional view of a normally closed contact type electromagnetic relay according to Embodiment 2 of the present invention.
In FIG. 2, there is a feature in that a step 20b is provided on the inner peripheral surface of the cap 20, and a return spring 18 is brought into contact with the step surface of the step 20b, and other configurations are the same as those in the first embodiment.
By comprising in this way, the nonelectroconductive member 19 in Embodiment 1 can be made unnecessary, and it becomes possible to obtain the normally closed contact type electromagnetic relay further simplified.

As described above, according to the present invention, it is applied to in-vehicle electromagnetic devices such as an engine starter, a generator, a charging circuit, etc. that receive vibrations of automobiles, etc., and the necessary suction force is suppressed. Therefore, it is possible to provide a normally closed contact type electromagnetic relay capable of ensuring the above.
The present invention is not limited to the above embodiment, and the embodiment can be appropriately modified and omitted within the scope of the invention.

10: Case, 11: Excitation coil, 12: Bobbin, 13: Contact side magnetic core,
14: Plunger, 15: Magnetic core, 16: Packing,
17: Non-conductive member for contact separation, 18: Return spring,
19: non-conductive member, 20: cap, 20a: contact chamber 21: main terminal 21a: fixed contact, 22: contact spring, 23: movable contact

Claims (4)

An excitation coil that generates magnetic flux when energized, a plunger that forms part of the magnetic flux path, and that is driven by electromagnetic force, and a contact-side magnetic core that is positioned in the direction in which the plunger is driven and restricts movement of the plunger A non-conductive member that is driven by the plunger and presses the movable contact so as to be separated from the fixed contact; a return spring that presses the plunger and the non-conductive member toward the non-contact side and returns to the normal position; A pair of main terminals held by a cap made of a non-conductive member and formed with the fixed contact, and a contact spring whose one end is in contact with a part of the cap and presses the movable contact against the fixed contact A normally closed contact type electromagnetic relay comprising:
A normally closed contact type electromagnetic relay characterized in that the return spring is disposed between the contact-side magnetic core and the fixed contact and in a space surrounded by the cap. The normally closed contact type electromagnetic relay according to claim 1, wherein one end of the return spring on the fixed contact side is held by a nonconductive member abutted on the fixed contact or a part of the cap. . The normally closed contact type electromagnetic relay according to claim 1, wherein one end of the return spring on the fixed contact side is held in contact with a part of the cap. An in-vehicle electromagnetic device, wherein the normally closed contact electromagnetic relay according to any one of claims 1 to 3 is applied.

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